It’s happening to a bunch of us on PS4 and Xbox.
You can see another thread on it here: Daily Rewards keep getting reset (Xbox)
The devs are working on it, but the best thing to do is file a support ticket to at least get your missing rewards covered.
I’m certain it happened Sunday night, since I have played every day for the last 13 days and I was back to day zero Monday morning. I’m not sure if it is limited to console or not, but people on both consoles are reporting the problem.